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Sony Repair Guide: Common Issues and Fixes

Brand Model Fault Detailed Problem Solution By
SONYSTRV25
Aged resistorsThe customer has owned this unit for 16 months and has hadit serviced by an independent servicer 4 times. she said it would playfor a while and then one or both channels would go out and it would stopworking. the relay would kick out.
SONYSRF40W
Defective headphone jackThis unit had good separation and power level but the outputwas distorted. it appeared to be an output problem. further examinationfound the headphone jack defective. although this circuit is a simpleone, this problem was misleading.
SONYSPP11
Open foil traceNo dial out, no dial tone, squelch broken opened base unitand measured voltages. no output from bridge rectifier d-6. found openfoil pattern at output lead of d-6.
SONYSEH310
Poor solder connectionOne channel cuts out intermittently when the space soundfunction was activated.
SONYPSX65
Defective ic106All functions inoperative.
SONYPSX40
Shorting q202We found the dc amp to be open (cracked) as a result of q202shorting - thus applying 18v to the ic.
SONYPSFL1
Noise during operationWhen the turntable moves in or out there is an objectionalclicking sound.
SONYMDRFM5
Part number for wireWire for connecting head-pieces to main cabinet. need blue,orange and grey colored wire that connects switch board to amp in ear-piece. has to be very small wire and stranded wire to last some time. -hq comments: p/n for 10m lengths are as follows:9-9
SONYICFC20W
Defective ic'sWhen power is turned on, display sets to 1:00 am or pm andwill not set time nor alarm functions. when powered up display will onlyindicated flashing dots - no numerial displays.
SONYICF2001
No amAll functions worked except am, found q41 (2sk107) withintermittent lead.
SONYCFS500
Tape jamTape counter belt comes off and jams in take up spindle assy.
SONYCFS500
Manual errorManual error. p. 30 (2) ref. #16 shown #16 pointing to spkgrille should be ref. #14.
SONYCFS45
Error in service manualThe ipb on page 37 shows the capstan belt as a take-up belt.also t/r s/b 66 gives a new p/n for the belt. -hq comments: we are issuing a s/b and t/n.
SONYPST22
Low level noiseTurntable, develops a low level static-like noise which isinduced into the audio ckt. the cartridge used also affects the level ofthe noise. an ortofon lm-10 produces about twice the amplitude of asony vl-7. grounding the motor shaft to ckt. ground el
SONYXR70
Improving ams responseAms would not operate for tapes with less than 4 to 6 secondsof silence. problem appears most often when rewinding close to thebeginning of the tape.
SONYTFM7720W
Defective oscillatorNo fm. all voltages looked good. all transistor wereconducting. osc. was not working.
SONYPSX45
Revolution noiseThis unit produced a heartbeat sound (one per revolution ofthe platter) which increased in intensity as the tonearm moved toward thecenter. this noise was being magnetically induced in the cartridgewindings. scoping the motor drives revealed spikes on
SONYICR4800
No am receptionNo am.
SONYICF2001
Could not receive am stationsPins 2, 11, 12 and 13 of ic201 were inconsistently outputtingdata. latch ic205 was not able to switch antennas to receive am stations.
SONYKP5040
Poor blue resolution, replaced blue crtThis unit had poor blue resolution and some bleeding.